Because he's hurt. From what I did to him, back in our world. Did what I could to patch him up but I told him to stay at the house until he's good.
[ There's other reasons too. Like maybe Dean thought it was better coming from him, to soften the blow, or something, rather than the two of them meeting face to face without any kind of precursor.
He doesn't say any of that, just starts stepping backwards to join the FEAR operatives getting themselves set up. ]
See ya around, Cas.
[ And with that he turns away, leaves the angel with those last words before getting down the business with the rest of the team. ]
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[ There's other reasons too. Like maybe Dean thought it was better coming from him, to soften the blow, or something, rather than the two of them meeting face to face without any kind of precursor.
He doesn't say any of that, just starts stepping backwards to join the FEAR operatives getting themselves set up. ]
See ya around, Cas.
[ And with that he turns away, leaves the angel with those last words before getting down the business with the rest of the team. ]